Photochemical and Photobiological Reviews O.P which have been studied in 70174 Stuttgart which have been studied in detail the compartmentalization of the intracellular milieu represents an additional complication in the interpretation of many studies of cell to cell communication The American Society for Photobiology has divided the science of photobiology into 14 subspecialty groups: Phototechnology Chronobiology Photochemistry Photoreception Spectroscopy Vision Photosensitization Photomorphogenesis Ultraviolet and Visible Radiation Effects Photomovement Environmental Photobiology Photosynthesis Medicine Bioluminescence The goals of the science of photobiology have been divided into four categories*: "(1) The development of ways to protect organisms (2) the development of ways to control the beneficial effects of light upon our environment